Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Senior Preferred Stock	Preferred Stock	Common Stock	Accumulated Deficit	Accumulated Other Comprehensive Income	Treasury Stock
Balance (shares) at Dec. 31, 2020		1	556	1,158
Balance at Dec. 31, 2020	$ 25,259	$ 120,836	$ 19,130	$ 687	$ (108,110)	$ 116	$ (7,400)
Comprehensive income:
Net income	16,987				16,987
Other comprehensive income (loss), net of tax effect:
Changes in net unrealized gains on available-for-sale securities, net of tax	(14)					(14)
Reclassification adjustment for gains included in net income, net of tax	(50)					(50)
Prior service cost and actuarial gains, net of amortization for defined benefit plans, net of tax	(9)					(9)
Total comprehensive income	16,914
Balance (shares) at Sep. 30, 2021		1	556	1,158
Balance at Sep. 30, 2021	42,173	$ 120,836	$ 19,130	$ 687	(91,123)	43	(7,400)
Balance (shares) at Jun. 30, 2021		1	556	1,158
Balance at Jun. 30, 2021	37,345	$ 120,836	$ 19,130	$ 687	(95,965)	57	(7,400)
Comprehensive income:
Net income	4,842				4,842
Other comprehensive income (loss), net of tax effect:
Changes in net unrealized gains on available-for-sale securities, net of tax	(10)					(10)
Reclassification adjustment for gains included in net income, net of tax	0					0
Prior service cost and actuarial gains, net of amortization for defined benefit plans, net of tax	(4)					(4)
Total comprehensive income	4,828
Balance (shares) at Sep. 30, 2021		1	556	1,158
Balance at Sep. 30, 2021	42,173	$ 120,836	$ 19,130	$ 687	(91,123)	43	(7,400)
Balance (shares) at Dec. 31, 2021		1	556	1,158
Balance at Dec. 31, 2021	47,357	$ 120,836	$ 19,130	$ 687	(85,934)	38	(7,400)
Comprehensive income:
Net income	11,497				11,497
Other comprehensive income (loss), net of tax effect:
Changes in net unrealized gains on available-for-sale securities, net of tax	(19)					(19)
Reclassification adjustment for gains included in net income, net of tax	11					11
Prior service cost and actuarial gains, net of amortization for defined benefit plans, net of tax	(6)					(6)
Total comprehensive income	11,483
Balance (shares) at Sep. 30, 2022		1	556	1,158
Balance at Sep. 30, 2022	58,840	$ 120,836	$ 19,130	$ 687	(74,437)	24	(7,400)
Balance (shares) at Jun. 30, 2022		1	556	1,158
Balance at Jun. 30, 2022	56,407	$ 120,836	$ 19,130	$ 687	(76,873)	27	(7,400)
Comprehensive income:
Net income	2,436				2,436
Other comprehensive income (loss), net of tax effect:
Changes in net unrealized gains on available-for-sale securities, net of tax	(4)					(4)
Reclassification adjustment for gains included in net income, net of tax	3					3
Prior service cost and actuarial gains, net of amortization for defined benefit plans, net of tax	(2)					(2)
Total comprehensive income	2,433
Balance (shares) at Sep. 30, 2022		1	556	1,158
Balance at Sep. 30, 2022	$ 58,840	$ 120,836	$ 19,130	$ 687	$ (74,437)	$ 24	$ (7,400)